Abstract : Treewidth and branchwidth are two closely related connectivity parameters of graphs. Graphs of treewidth at most k have well-known alternative characterizations as subgraphs of chordal graphs and as partial k-trees. In this paper we give analogous alternative characterizations for graphs of branchwidth at most k. We first show that they are the subgraphs of chordal graphs where every maximal clique X has three subsets of size at most k each such that any two subsets have union X, with the property that every minimal separator contained in X is contained in one of the three subsets. Secondly, we give a characterization of the edge-maximal graphs of branchwidth k, that we call k-branches.
https://hal-lirmm.ccsd.cnrs.fr/lirmm-00371208
Contributeur : Christophe Paul
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Soumis le : jeudi 26 mars 2009 - 21:53:30
Dernière modification le : jeudi 11 janvier 2018 - 06:26:13
